Polypeptide-human rna binding protein 19 and the polynucleotide encoding it

ABSTRACT

A novel polypeptide-human RNA binding protein 19, the polynucleotide encoding it and a method producing the polypeptide by DNA recombinant technology. The present invention further discloses a method using the peptide for treating various disorders, e.g., protein metabolism disorder, embryonic deformative, various tumors, and immunological diseases. The protein is also suitable for human antisenescence research. The present invention also discloses an antagonist of the polypeptide and its therapeutic application. The present invention further discloses the use of the polynucleotide encoding the novel human RNA binding protein 19.

FIELD OF INVENTION

[0001] The invention relates to the field of biotechnology. In particular, the invention relates to a novel polypeptide, human RNA binding protein 19, and a polynucleotide sequence encoding said polypeptide. The invention also relates to the method for the preparation and use of said polynucleotide and polypeptide.

TECHNICAL BACKGROUND

[0002] In eukaryotes, the interaction between single stranded RNA and protein is extensively involved in physiological activities of the cell, such as RNA synthesis and processing, mRNA stabilization, sex determination of Drosophila megalogaster, cell proliferation, maturation and apoptosis. Single stranded RNA binding proteins can be classified as follows:

[0003] The First Class: Heterogeneous Nuclear Ribonucleoproteins, hnRNP Introns that exist in most protein-encoding structural genes of eukaryotes are transcribed with exons by RNA polymerase II. Thus the primary transcript of mRNA is a precursor with higher molecular weight, namely heterogeneous nuclear RNA (hnRNA). After processing, hnRNA become mature functional mRNA. Meanwhile, HnRNP, the hnRNA binding proteins, function to package hnRNA, enabling hnRNA to fold correctly and splice accurately, and protect hnRNA from degradation.

[0004] The Second Class: Small Nuclear Ribonucleoproteins, snRNP

[0005] The splicing of introns and ligation of exons involve many steps and factors. It is known that this process is finished by a 60 s compound, namely the splicesome, which contains several small nuclear ribonucleoproteins and other proteins. SnRNA is one type of small molecular RNAs of no more than 300 ribonucleotides present in the cell nucleus. SnRNAs exist only in compound form. They always are bound to certain specific proteins (i.e., the small nuclear ribonucleoproteins mentioned above), and play an important role in RNA splicing.

[0006] The accuracy of mRNA splicing is important in maintaining normal physiological functions of organisms. In some genetic diseases there are abnormal splicing and processing of precursor mRNAs. For example, β-Mediterranean anemia is caused by the abnormal splicing of the precursor of β-globulin mRNA.

[0007] The Third Class: mRNA and Precursor mRNA Associated Proteins

[0008] This type of proteins include the following: protein synthesis initiation factor 4B (eIF-4B), necessary for the binding of mRNA and ribosome; nucleolin, necessary for active synthesis of rRNA from rDNA; single strand binding protein (SSB1) in yeast, and poly-A binding protein (PABP), etc.

[0009] The fourth class of single stranded RNA binding proteins include sex determination protein of Drosophila megalogaster; Sx1, Tra-2; neuron-specific RNA metabolizing protein; protein X16, which is related to cell proliferation and maturation and TIA-1 and TIAR, etc., which are involved in apoptosis.

[0010] All the above four classes of proteins contain a characteristic conservative sequence: xxxxxxx######xxxxxxxxxxxxxxxxxxxxxxxxxxxxx########xxxxxxxxxxxxxxxxxxxxxxxxx        RNP-2                               RNP-1

[0011] The sequence of RNP-1 is [RK]-G-EDRKHPCG-[AGSCI]-[FY]-[LIVA]-x-[FYLM].

[0012] The polypeptide of the present invention contains the above characteristic conservative sequence, and is determined to be a new RNA binding protein and named RNA binding protein 19.

[0013] It is determined that human RNA binding protein 19 plays an essential role in important biological functions. Accordingly, the identification and isolation of human RNA binding protein 19, especially of its amino acid sequences are important for elucidating its function under normal and clinical conditions, for disease diagnosis and for drug development.

OBJECTIVES OF THE INVENTION

[0014] One objective of the invention is to provide an isolated novel polypeptide, i.e., a human RNA binding protein 19, and fragments, analogues and derivatives thereof.

[0015] Another objective of the invention is to provide a polynucleotide encoding said polypeptide.

[0016] Another objective of the invention is to provide a recombinant vector containing a polynucleotide encoding a human RNA binding protein 19.

[0017] Another objective of the invention is to provide a genetically engineered host cell containing a polynucleotide encoding a human RNA binding protein 19.

[0018] Another objective of the invention is to provide a method for producing a human RNA binding protein 19.

[0019] Another objective of the invention is to provide an antibody against a human RNA binding protein 19 of the invention.

[0020] Another objective of the invention is to provide mimetics, antagonists, agonists, and inhibitors for the polypeptide of the human RNA binding protein 19.

[0021] Another objective of the invention is to provide a method for the diagnosis and treatment of the diseases associated with an abnormality of human RNA binding protein 19.

[0022] The present invention relates to an isolated polypeptide, which is originated from human, and comprises a polypeptide having the amino acid sequence of SEQ ID NO: 2, or its conservative mutants, or its active fragments, or its active derivatives and its analogues. Preferably, the polypeptide has the amino acid sequence of SEQ ID NO: 2.

[0023] The present invention also relates to an isolated polynucleotide, which comprises a nucleotide sequence or its variant selected from the group consisting of (a) the polynucleotide encoding a polypeptide comprising the amino acid sequence of SEQ ID NO:2; and (b) a polynucleotide complementary to the polynucleotide (a); (c) a polynucleotide having at least 70% homology to the polynucleotide (a) or (b). More preferably, said nucleotide sequence is selected from the group consisting of (a) the sequence of position 201-734 in SEQ ID NO: 1; and (b) the sequence of position 1-1712 in SEQ ID NO: 1.

[0024] The present invention also includes: a vector containing the polynucleotide of the invention, especially an expression vector; a host cell genetically engineered with the vector which may be produced via transformation, transduction or transfection; and a method for the production of the polypeptide through the process of host cell cultivation and expression product harvest.

[0025] The invention also involves an antibody which specifically binds to the inventive polypeptide.

[0026] The invention also includes a method for the selection of compounds which could simulate, activate, antagonize, or repress the activity of human RNA binding protein 19, and the compounds obtained thereby.

[0027] The invention also includes a method for in vitro assay for diseases or disease susceptibility related to abnormal expression of human RNA binding protein 19. The method comprises mutation detection in the polypeptide or its encoding polynucleotide sequence, or the quantitative determination or biological activity assay of the inventive polypeptide in biological samples.

[0028] The invention also includes pharmaceutical compositions which comprise the inventive polypeptide, its mimetic, agonist, antagonist, or repressor, and a pharmaceutically acceptable carrier.

[0029] The said invention also includes application of the inventive polypeptide and/or its polynucleotide for drug development for the treatment of cancers, developmental diseases, immune diseases, or other diseases caused by abnormal expression of human RNA binding protein 19.

[0030] Other aspects of the invention are apparent to the skilled in the art in view of the disclosure.

[0031] The terms used in this specification and claims have the following meanings, unless specifically otherwise defined.

[0032] “Nucleotide sequence” refers to oligonucleotide, nucleotide, or polynucleotide and parts of polynucleotide. It includes genomic or synthetic DNA or RNA, which could be single-stranded or double-stranded, and could represent the sense strand or the antisense strand. Similarly, the term “amino acid sequence” refers to oligopeptide, peptide, polypeptide, or protein sequence and parts of proteins. When the “amino acid sequence” is related to the sequence of a natural protein, the amino acid sequence of the “peptide” or “protein” is not limited to be identical to the sequence of that natural protein.

[0033] “Variant” of a protein or polynucleotide refers to the amino acid sequence with one or several amino acid changed, or its encoding polynucleotide sequence with one or several nucleotides changed, respectively. Such changes include deletion, insertion, or substitution of amino acids in the amino acid sequence, or of nucleotides in the polynucleotide sequence. In the context of peptide variant, these changes could be conservative and the substituted amino acid has similar structure or chemical characteristics as the original one, just as the substitution of Ile with Leu. Changes also could be not conservative, just as the substitution of Ala with Trp.

[0034] “Deletion” refers to the deletion of one or several amino acids in the amino acid sequence, or of one or several nucleotides in the nucleotide sequence.

[0035] “Insertion” or “addition” refers to the addition of one or several amino acids in the amino acid sequence, or of one or several nucleotides in the nucleotide sequence, comparing to the natural molecule. “Substitution” refers to the change of one or several amino acids, or of one or several nucleotides, into different ones without changing the length of the sequence.

[0036] “Biological activity” refers to the structural, regulational or biochemical functions of a protein. Similarly, the term “immunological activity” refers to the ability of a natural, recombinant, or synthetic protein to induce a specific immunological reaction, or of binding to specific antibody in an appropriate animal or cell.

[0037] “Agonist” refers to a molecule which could up-regulate the activity of human RNA-binding protein 19 by binding or changing it. Agonists may be proteins, nucleotides, carbohydrates or any other molecules.

[0038] “Antagonist” or “repressor” refers to the kind of molecule which could repress or downregulate the biological activity or immune activity of human RNA-binding protein 19. Antagonists or repressores may be proteins, nucleotides, carbohydrates or any other molecules.

[0039] “Regulation” refers to functional changes of a protein, including increase or decrease of the protein activity, changes in binding specifity, changes of any other biological characteristics, functional or immunological characteristics.

[0040] “Substantially pure” refers to a condition of purity where the molecule at issue exists without any other naturally related proteins, lipids, saccharides, or other substances. Those of ordinary skills can purify human RNA-binding protein 19 by standard protein purification techniques. Substantially pure human RNA-binding protein 19 produces a single main band in denaturing polyacrylamide gel. The purity of human RNA-binding protein 19 can be analyzed by amino acid sequence analysis.

[0041] “Complementary” or “complementation” refers to the natural conjugation of polynucleotides by base pairing under appropriate ion and temperature concentrations. For instance, the sequence 5′-C-T-G-A-3′ could bind to its complementary sequence 3′-G-A-C-T-5′. The complementation between two single-stranded nucleic acid molecules could be partial or complete. Complementary degree between two single strands has obvious influence on the efficiency of hybrid formation and the strength of the hybrid formed.

[0042] “Homology” refers to the complementary degree. Homology may be partial or complete. “Partial homology” refers to a partially complementary sequence compared to a target nucleotide, and the sequence could at least partially inhibit the hybridization between a completely complementary sequence and the target nucleotide. Inhibition of the hybridization could be assayed by hybridization (e.g., Southern blot or Northern blot) under a lower stringency condition. Substantially complementary sequence or hybrid probe could compete with the completely complementary sequence and inhibit its hybridization with the target sequence under a lower stringency condition. This effect does not mean that nonspecific binding is allowed under a lower stringency condition, because specific or selective reaction is still required for hybridization under a lower stringency condition.

[0043] “Percent identity” refers to the percentage of sequence identity or similarity when two or several amino acid or nucleotide sequences are compared. Percent identity could be determined by computation method such as MEGALIGN program (Lasergene software package, DNASTAR, Inc., Madison Wis.). MEGALIGN program can compare two or several sequences with different of methods such as the Cluster method (Higgins, D. G. and P. M. Sharp (1988) Gene 73:237-244). The Cluster method examines the distance between all pairs and arrange the sequences into clusters. Then the clusters are partitioned by pair or group. The percent identity between two amino acid sequences such as sequence A and B can be calculated by the following equation: $\frac{{Number}\quad {of}\quad {paired}\quad {residues}\quad {between}\quad {sequences}\quad A\quad {and}\quad B}{\begin{matrix} \left( {{{Residues}\quad {of}\quad {sequence}\quad A} - {{spacing}\quad {residues}\quad {in}\quad {sequence}\quad A} -} \right. \\ \left. {{spacing}\quad {residue}\quad {in}\quad {sequence}\quad B} \right) \end{matrix}} \times 100$

[0044] Percent identity between nucleotide sequences can be determined by Cluster method or other well-known methods in this field such as the Jotun Hein method (Hein J., 1990, Methods in Enzymology 183:625-645)

[0045] “Similarity” refers to the identical degree or conservative substitution degree of amino acid residues in corresponding sites of the amino acid sequences compared to each other. Amino acids for conservative substitution are: negative charged amino acids including Asp and Glu; positive charged amino acids including Leu, Ile and Val; Gly and Ala; Asn and Gln; Ser and Thr; Phe and Tyr.

[0046] “Antisense” refers to the nucleotide sequences complementary to a specific DNA or RNA sequence. “Antisense strand” refers to the nucleotide strand complementary to the “sense strand.”

[0047] “Derivative” refers to the a modified version of the inventive protein or a chemically modified nucleotide encoding it. This kind of modified chemical can be derived from replacement of the hydrogen atom with alkyl, acyl, or amino. The nucleotide derivative can encode peptide retaining the major biological characteristics of the natural molecule.

[0048] “Antibody” refers to the intact antibody or its fragments such as Fa, F(ab′)₂ and Fv, and it can specifically bind to epitope(s) of human RNA-binding protein 19.

[0049] “Humanized antibody” refers to the antibody which has its amino acid sequence in non-antigen binding region replaced to mimic human antibody and still retain the original binding activity.

[0050] The term “isolated” refers to the removal of a material out of its original environment (for instance, if the substance is naturally produced, its original environment refers to its natural environment). For example, a naturally produced polynucleotide or a peptide in a living organism means it is not “isolated.” While the separation of the polynucleotide or a peptide from its coexisting materials in natural system means it is “isolated.” This polynucleotide may be a part of a vector. This polynucleotide or peptide may also be part of a compound. Since the vector or compound is not part of its natural environment, the polynucleotide or peptide is “isolated.”

[0051] As used herein, the term “isolated” refers to a substance which has been isolated from the original environment. For naturally occurring substance, the original environment is the natural environment. For example, the polynucleotide and polypeptide in a naturally occurring state in the viable cells are not isolated or purified. However, if the same polynucleotide and polypeptide have been isolated from other components naturally accompanying them, they are isolated or purified.

[0052] As used herein, “isolated human RNA-binding protein 19,” means that human RNA-binding protein 19, does not essentially contain other proteins, lipids, carbohydrate or any other substances associated therewith in nature. The skilled in the art can purify human RNA-binding protein 19, by standard protein purification techniques. The purified polypeptide forms a single main band on a non-reductive PAGE gel. The purity of human RNA-binding protein 19 can be analyzed by amino acid sequence analysis.

[0053] The invention provides a novel polypeptide—human RNA-binding protein 19, which comprises the amino acid sequence shown in SEQ ID NO: 2. The polypeptide of the invention may be a recombinant polypeptide, natural polypeptide, or synthetic polypeptide, preferably a recombinant polypeptide. The polypeptide of the invention may be a purified natural product or a chemically synthetic product. Alternatively, it may be produced from prokaryotic or eukaryotic hosts, such as bacterial, yeast, higher plant, insect, and mammal cells, using recombinant techniques. Depending on the host used in the protocol of recombinant production, the polypeptide of the invention may be glycosylated or non-glycosylated. The polypeptide of the invention may or may not comprise the starting Met residue.

[0054] The invention further comprises fragments, derivatives and analogues of human RNA-binding protein 19. As used in the invention, the terms “fragment,” “derivative” and “analogue” mean the polypeptide that essentially retains the same biological functions or activity of human RNA-binding protein 19 of the invention. The fragment, derivative or analogue of the polypeptide of the invention may be (i) one in which one or more of the amino acid residues are substituted with a conserved or non-conserved amino acid residue (preferably a conserved amino acid residue) and such substituted amino acid residue may or may not be one encoded by the genetic code; or (ii) one in which one or more of the amino acid residues are substituted with other residues, including a substituent group; or (iii) one in which the mature polypeptide is fused with another compound, such as a compound to increase the half-life of the polypeptide (for example, polyethylene glycol); or (iv) one in which additional amino acids are fused to the mature polypeptide, such as a leader or secretory sequence or a sequence which is employed for purification of the mature polypeptide or a proprotein sequence. Such fragments, derivatives and analogs are deemed to be within the scope of the skilled in the art from the teachings herein.

[0055] The invention provides an isolated nucleic acid or polynucleotide which comprises the polynucleotide encoding an amino acid sequence of SEQ ID NO: 2. The polynucleotide sequence of the invention includes the nucleotide sequence of SEQ ID NO: 1. The polynucleotide of the invention was identified in a human embryonic brain cDNA library. Preferably, it comprises a full-length polynucleotide sequence of 1712 bp, whose ORF (201-734) encodes 87 amino acids. This peptide has the same characteristic sequences to those of the human RNA binding protein. Accordingly, the novel human RNA-binding protein 19 has similar structures and biological functions to those of the human RNA binding protein.

[0056] The polynucleotide according to the invention may be in the forms of DNA or RNA. The forms of DNA include cDNA, genomic DNA, and synthetic DNA, etc., in single stranded or double stranded form. DNA may be an encoding strand or non-encoding strand. The coding sequence for mature polypeptide may be identical to the coding sequence shown in SEQ ID NO: 1, or is a degenerate sequence. As used herein, the term “degenerate sequence” means an sequence which encodes a protein or peptide comprising a sequence of SEQ ID NO: 2 and which has a nucleotide sequence different from the sequence of coding region in SEQ ID NO: 1.

[0057] The polynucleotide encoding the mature polypeptide of SEQ ID NO: 2 includes those encoding only the mature polypeptide, those encoding mature polypeptide plus various additional coding sequence, the coding sequence for mature polypeptide (and optional additional encoding sequence) plus the non-coding sequence.

[0058] The term “polynucleotide encoding the polypeptide” includes polynucleotides encoding said polypeptide and polynucleotides comprising additional coding and/or non-coding sequences.

[0059] The invention further relates to variants of the above polynucleotides which encode a polypeptide having the same amino acid sequence of invention, or a fragment, analogue and derivative of said polypeptide. The variant of the polynucleotide may be a naturally occurring allelic variant or a non-naturally occurring variant. Such nucleotide variants include substitution, deletion, and insertion variants. As known in the art, an allelic variant may have a substitution, deletion, and insertion of one or more nucleotides without substantially changing the functions of the encoded polypeptide.

[0060] The present invention further relates to polynucleotides which hybridize to the hereinabove-described sequences. That is, there is at least 50% and preferably at least 70% identity between the sequences. The present invention particularly relates to polynucleotides, which hybridize to the polynucleotides of the invention under stringent conditions. As herein used, the term “stringent conditions” means the following conditions: (1) hybridization and washing under low ionic strength and high temperature, such as 0.2×SSC, 0.1% SDS, 60° C.; or (2) hybridization after adding denaturants, such as 50% (v/v) formamide, 0.1% bovine serum/0.1% Ficoll, 42° C.; or (3) hybridization only when the homology of two sequences at least 95%, preferably 97%. Further, the polynucleotides which hybridize to the hereinabove described polynucleotides encode a polypeptide which retains the same biological function and activity as the mature polypeptide of SEQ ID NO: 2

[0061] The invention also relates to nucleic acid fragments hybridized with the hereinabove sequence. As used in the present invention, the length of the “nucleic acid fragment” is at least more than 10 bp, preferably at least 20-30 bp, more preferably at least 50-60 bp, and most preferably at least 100 bp. The nucleic acid fragment can be used in amplification techniques of nucleic acid, such as PCR, so as to determine and/or isolate the polynucleotide encoding human RNA-binding protein 19.

[0062] The polypeptide and polynucleotide of the invention are preferably in the isolated form, preferably purified.

[0063] According to the invention, the specific nucleic acid sequence encoding human RNA-binding protein 19 can be obtained in various ways. For example, the polynucleotide is isolated by hybridization techniques well-known in the art, which include, but are not limited to 1) the hybridization between a probe and genomic or cDNA library so as to select a homologous polynucleotide sequence, and 2) antibody screening of expression library so as to obtain polynucleotide fragments encoding polypeptides having common structural features.

[0064] According to the invention, DNA fragment sequences may further be obtained by the following methods: 1) isolating double-stranded DNA sequence from genomic DNA; and 2) chemical synthesis of DNA sequence so as to obtain the double-stranded DNA.

[0065] Among the above methods, the isolation of genomic DNA is the least frequently used. A commonly used method is the direct chemical synthesis of DNA sequence. A more frequently used method is the isolation of cDNA sequence. Standard methods for isolating the cDNA of interest is to isolate mRNA from donor cells that highly express said gene followed by reverse transcription of mRNA to form plasmid or phage cDNA library. There are many established techniques for extracting mRNA and the kits are commercially available (e.g. Qiagene). Conventional method can be used to construct cDNA library (Sambrook, et al., Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory. New York, 1989). The cDNA libraries are also commercially available. For example, Clontech Ltd. has various cDNA libraries. When PCR is further used, even an extremely small amount of expression products can be cloned.

[0066] Numerous well-known methods can be used for screening for the polynucleotide of the invention from cDNA library. These methods include, but are not limited to, (1) DNA-DNA or DNA-RNA hybridization; (2) the appearance or loss of the function of a marker-gene; (3) the determination of the level of human RNA-binding protein 19 give transcripts; (4) the determination of protein product of gene expression by immunology methods or biological activity assays. The above methods can be used alone or in combination.

[0067] In method (1), the probe used in the hybridization could be homologous to any portion of polynucleotide of invention. The length of probe is typically at least 10 nucleocides, preferably at least 30 nucleocides, more preferably at least 50 nucleocides, and most preferably at least 100 nucleotides. Furthermore, the length of the probe is usually less than 2000 nucleotides, preferably less than 1000 nucleotides. The probe usually is the DNA sequence chemically synthesized on the basis of the sequence information. Of course, the gene of the invention itself or its fragment can be used as a probe. The labels for DNA probe include, e.g., radioactive isotopes, fluoresceins or enzymes such as alkaline phosphatase.

[0068] In method (4), the detection of the protein products expressed by human RNA-binding protein 19 gene can be carried out by immunology methods, such as Western blotting, radioimmunoassay, and ELISA.

[0069] The method of amplification of DNA/RNA by PCR (Saiki, et al. Science 1985; 230:1350-1354) is preferably used to obtain the polynucleotide of the invention. Especially when it is difficult to obtain the full-length cDNA, the method of RACE (RACE—cDNA terminate rapid amplification) is preferably used. The primers used in PCR can be selected according to the polynucleotide sequence information of the invention disclosed herein, and can be synthesized by conventional methods. The amplified DNA/RNA fragments can be isolated and purified by conventional methods such as gel electrophoresis.

[0070] Sequencing of polynucleotide sequence of the gene of the invention or its various DNA fragments can be carried out by the conventional dideoxy sequencing method (Sanger et al. PNAS, 1977, 74: 5463-5467). Sequencing of polynucleotide sequence can also be carried out using the commercially available sequencing kits. In order to obtain the full-length cDNA sequence, it is necessary to repeat the sequencing process. Sometimes, it is needed to sequence the cDNA of several clones to obtain the full-length cDNA sequence.

[0071] The invention further relates to a vector comprising the polynucleotide of the invention, a genetically engineered host cell transformed with the vector of the invention or directly with the sequence encoding human RNA-binding protein 19, and a method for producing the polypeptide of the invention by recombinant techniques.

[0072] In the present invention, the polynucleotide sequences encoding human RNA-binding protein 19 may be inserted into a vector to form a recombinant vector containing the polynucleotide of the invention. The term “vector” refers to a bacterial plasmid, bacteriophage, yeast plasmid, plant virus or mammalian virus such as adenovirus, retrovirus or any other vehicle known in the art. Vectors suitable for use in the present invention include, but are not limited to the T7-based expression vector for expression in bacteria (Rosenberg, et al., Gene, 56:125, 1987), the PMSXND expression vector for expression in mammalian cells (Lee and Nathans, J. Biol. Chem., 263:3521, 1988) and baculovirus-derived vectors for expression in insect cells. Any plasmid or vector can be used to construct the recombinant expression vector as long as it can replicate and is stable in the host. One important feature of an expression vector is that the expression vector typically contains an origin of replication, a promoter, a marker gene as well as translation regulatory components.

[0073] Methods known in the art can be used to construct an expression vector containing the DNA sequence of human RNA-binding protein 19 and appropriate transcription/translation regulatory components. These methods include in vitro recombinant DNA technique, DNA synthesis technique, in vivo recombinant technique and so on (Sambroook, et al. Molecular Cloning, a Laboratory Manual, cold Spring Harbor Laboratory. New York, 1989). The DNA sequence is operatively linked to a proper promoter in an expression vector to direct the synthesis of mRNA. Exemplary promoters are lac or trp promoter of E. coli; PL promoter of A phage; eukaryotic promoters including CMV immediate early promoter, HSV thymidine kinase promoter, early and late SV40 promoter, LTRs of retrovirus, and other known promoters which control gene expression in the prokaryotic cells, eukaryotic cells or viruses. The expression vector may further comprise a ribosome binding site for initiating translation, transcription terminator and the like. Transcription in higher eukaryotes is increased by inserting an enhancer sequence into the vector. Enhancers are cis-acting elements of DNA, usually about from 10 to 300 bp in length that act on a promoter to increase gene transcription level. Examples include the SV40 enhancer on the late side of the replication origin 100 to 270 bp, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers.

[0074] Further, the expression vector preferably comprises one or more selective marker genes to provide a phenotype for the selection of the transformed host cells, e.g., the dehydrofolate reductase, neomycin resistance gene and GFP (green flurencent protein) for eukaryotic cells, as well as tetracycline or ampicillin resistance gene for E. coli.

[0075] The skilled in the art know clearly how to select appropriate vectors, transcriptional regulatory elements, e.g., promoters, enhancers, and selective marker genes.

[0076] According to the invention, polynucleotide encoding human RNA-binding protein 19 or recombinant vector containing said polynucleotide can be transformed or transfected into host cells to construct genetically engineered host cells containing said polynucleotide or said recombinant vector. The term “host cell” means prokaryote, such as bacteria; or primary eukaryote, such as yeast; or higher eukaryotic, such as mammalian cells. Representative examples are bacterial cells, such as E. coli, Streptomyces, Salmonella typhimurium; fungal cells, such as yeast; plant cells; insect cells such as Drosophila S2 or Sf9; animal cells such as CHO, COS or Bowes melanoma.

[0077] Transformation of a host cell with the DNA sequence of the invention or a recombinant vector containing the DNA sequence may be carried out by conventional techniques as are well known to those ordinarily skilled in the art. When the host is prokaryotic, such as E. coli, competent cells, which are capable of DNA uptake, can be prepared from cells harvested at the exponential growth phase and subsequently treated by the CaCl₂ method using procedures well known in the art. Alternatively, MgCl2 can be used. Transformation can also be carried out by electroporation, if desired. When the host is an eukaryote, transfection methods as well as calcium phosphate precipitation may be used. Conventional mechanical procedures such as micro-injection, electroporation, or liposome-mediated transfection may also be used.

[0078] The recombinant human RNA-binding protein 19 can be expressed or produced by the conventional recombinant DNA technology (Science, 1984; 224:1431), using the polynucleotide sequence of the invention. The steps generally include:

[0079] (1) transfecting or transforming the appropriate host cells with the polynucleotide (or variant) encoding human RNA-binding protein 19 of the invention or the recombinant expression vector containing said polynucleotide;

[0080] (2) culturing the host cells in an appropriate medium; and

[0081] (3) isolating or purifying the protein from the medium or cells.

[0082] In Step (2) above, depending on the host cells used, the medium for cultivation can be selected from various conventional mediums. The host cells are cultured under a condition suitable for its growth until the host cells grow to an appropriate cell density. Then, the selected promoter is induced by appropriate means (e.g., temperature shift or chemical induction) and cells are cultured for an additional period.

[0083] In Step (3), the recombinant polypeptide may be included in the cells, or expressed on the cell membrane, or secreted out of the cell. If desired, physical, chemical and other properties can be utilized in various isolation methods to isolate and purify the recombinant protein. These methods are well-known to those skilled in the art and include, but are not limited to conventional renaturation treatment, treatment by a protein precipitant (such as salt precipitation), centrifugation, cell lysis by osmosis, sonication, supercentrifugation, molecular sieve chromatography or gel chromatography, adsorption chromatography, ion exchange chromatagraphy, HPLC, and any other liquid chromatagraphy, and a combination thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The following drawings are provided to illustrate the embodiment of the invention, not to limit the scope of invention defined by the claims.

[0085]FIG. 1 shows an alignment comparison of amino acid sequences of human RNA binding protein 19 which has 118 amino acids located in positions 22-139 of SEQ ID NO: 2 and the characteristic structural domain of human RNA binding protein. The upper sequence is human RNA binding protein 19, and the lower sequence is the characteristic structural domain of human RNA binding protein. The identical and similar amino acids are indicated by a one-letter code of amino acid and “+” respectively.

[0086]FIG. 2 shows the SDS-PAGE of the isolated human RNA binding protein 19, which has a molecular weight of 19 kDa. The isolated protein band is marked with an arrow.

EXAMPLES

[0087] The invention is further illustrated by the following examples. It is appreciated that these examples are only intended to illustrate the invention, not to limit the scope of the invention. For the experimental methods in the following examples, they are performed under routine conditions, e.g., those described by Sambrook. et al., in Molecule Clone: A Laboratory Manual, New York: Cold Spring Harbor Laboratory Press, 1989, or as instructed by the manufacturers, unless otherwise specified.

Example 1 Cloning of Human RNA Binding Protein 19 Gene

[0088] Total RNA from a human embryonic brain was extracted by the one-step method with guanidinium isocyanate/phenol/chloroform. The poly(A) mRNA was isolated from the total RNA with Quik mRNA Isolation Kit (Qiegene). cDNA was prepared by reverse transcription with 2 μg poly(A) mRNA. The cDNA fragments were inserted into the polyclonal site of pBSK(+) vector (Clontech) using Smart cDNA cloning kit (Clontech) and then transformed into DH5α to form the cDNA library. The 5′- and 3′-ends of all clones were sequenced with the Dye Terminate Cycle Reaction Sequencing Kit (Perkin-Elmer) and ABI 377 Automatic Sequencer (Perkin-Elmer). The sequenced cDNA were compared with the public database of DNA sequences (Genebank) and the DNA sequence of one clone 2383g09 was found to be a novel DNA sequence. The inserted cDNA sequence of clone 2383g09 was dual-directionally sequenced with a serial of synthesized primers. It was indicated that the full length cDNA contained in clone 2383g09 was 1712 bp (SEQ ID NO: 1) with a 264 bp ORF located in positions 201-734 which encoded a novel protein (SEQ ID NO: 2). This clone was named pBS2383g09 and the encoded protein was named human RNA binding protein 19.

Example 2 Domain Analysis of cDNA Clone

[0089] The DNA sequence encoding human RNA binding protein 19 of the present invention and the protein sequence it encoded were domain analyzed in databases such as Prosite with the profile scan program from GCG (Basiclocal Alignment Search Tool) (Altschul, SF et al., 1990, J. Mol. Biol.; 215:403-10). Human RNA binding protein 19 of the invention was found to have homology with human RNA binding protein between positions 22-139. The result of homology comparison is shown in FIG. 1, which the rate of homology being 0.12, a score of 6.54, and the threshold value of 6.43.

Example 3 Cloning Human RNA Binding Protein 19 Gene by RT-PCR

[0090] The template was total RNA extracted from a human embryonic brain. Reverse transcription was carried out with an oligo-dT primer to produce cDNAs. After the cDNA was purified with a Qiagen Kit, PCR was carried out with the following primers: Primer 1: 5′-CATCCTGAGAACTGAAATTGATCGC-3′ (SEQ ID NO:3) Primer 2: 5′-ATAAAATTTTTGAATTTATGTTCAA-3′ (SEQ ID NO:4)

[0091] Primer 1 is the forward sequence started from position 1 of the 5′ end of SEQ ID NO: 1.

[0092] Primer 2 is the reverse sequence at the 3′ end of SEQ ID NO: 1.

[0093] The amplification condition was a 50 μl reaction system containing 50 mmol/L KCl, 10 mmol/L Tris-Cl (pH8.5), 1.5 mmol/L MgCl₂, 200 μmol/L dNTP, 10 pmol of each primer, 1U Taq DNA polymerase (Clontech). The reaction was performed on a PE 9600 DNA amplifier with the following parameters: 94° C. 30 sec, 55° C. 30 sec, and 72° C. 2 min for 25 cycles. β-actin was used as a positive control, and a blank template, as a negative control in RT-PCR. The amplified products were purified with a QIAGEN kit, and linked with a pCR vector (Invitrogen) using a TA Cloning Kit. DNA sequencing results show that the DNA sequence of PCR products was identical to nucleotides 1-1712 of SEQ ID NO: 1.

Example 4 Northern Blotting of Expression Product of Human RNA-Binding Protein 19 Gene

[0094] Total RNA was extracted by the one-step method (Anal. Biochem 1987, 162, 156-159) with guanidinium isocyanate-phenol-chloroform as follows. That is, homogenate the cells using 4M guanidinium isocyanate-25 mM sodium citrate, 0.2 sodium acetate (pH 4.0), add 1 volume phenol and 1/5 volume chloroformisoamyl alcohol (49:1), centrifuge after mixing. Take out the water phase, add 0.8 volume isopropyl alcohol, then centrifuge the mixture. Wash the RNA precipitation using 70% ethanol, then dry, then dissolve it in the water. 20 μg RNA was electrophoresed on the 1.2% agarose gel containing 20 mM 3-(N-morpholino) propane sulfonic acid (pH 7.0)-5 mM sodium acetate-1 mM EDTA-2.2M formaldehyde. Then transfer it to a nitrocellulose filter. Prepare the ³²P-labelled DNA probe with α-³²P dATP by random primer method. The DNA probe used is the coding sequence (positions 201-734) of human RNA-binding protein 19 amplified by PCR indicated in FIG. 1. The nitrocellulose filter with the transferred RNA was hybridized with the ³²P-labelled DNA probe (2×10⁶ cpm/ml) overnight in a buffer containing 50% formamide-25 mM KH₂PO₄ (Ph7.4)-5× Denhardt's solution and 200 μg/ml salmine. Then wash the filter in the 1×SSC-0.1% SDS, at 55° C., for 30 min. Then analyze and quantify using a Phosphor Imager.

Example 5 In vitro Expression, Isolation and Purification of Recombinant Human RNA-Binding Protein 19

[0095] A pair of primers for specific amplification was designed based on SEQ ID NO: 1 and the encoding region in FIG. 1, the sequences are as follows: (SEQ ID No:5) Primer 3: 5′-CCCCATATGATGCTCTGTCACCTTCAAAGGATGG-3′ (SEQ ID No:6) Primer 4: 5′-CCCAAGCTTCTTCAACATGCCGCTTCTGTTCTTC-3′

[0096] These two primers contain a NdeI and BamHI cleavage site on the 5′ end respectively. Within the sites are the coding sequences of the 5′ and 3′ end of the desired gene. NdeI and BamHI cleavage sites correspond to the selective cleavage sites on the expression vector pET-28b(+) (Novagen, Cat. No. 69865.3). PCR amplification was performed with the plasmid pBS-2833g09 containing the full-length target gene as a template. The PCR reaction was subject to a 50 μl system containing 10 pg pBS-2383g09 plasmid, 10 pmol of Primer-3 and 10 pmol of Primer-4, 1 μl of Advantage polymerase Mix (Clontech). The parameters of PCR were 94° C. 20 sec, 60° C. 30 sec, and 68° C. 2 min for 25 cycles. After digesting the amplification products and the plasmid pET-28(+) by NdeI and EcoRI, the large fragments were recovered and ligated with T4 ligase. The ligated product was transformed into E. coli DH5α cells with the calcium chloride method. After cultured overnight on a LB plate containing a final concentration of 30 μg/ml kanamycin, positive clones were selected using colony PCR and then sequenced. The positive clone (pET-2383g09) with the correct sequence was selected and the recombinant plasmid thereof was transformed into BL21(DE3)plySs (Novagen) using the calcium chloride method. In an LB liquid medium containing a final concentration of 30 μg/ml of kanamycin, the host bacteria BL21(pET-2383g09) were cultured at 37° C. to the exponential growth phase, then IPTG were added with the final concentration of 1 mmol/L, the cells were cultured for another 5 hours, and then centrifuged to harvest the bacteria. After the bacteria were sonicated, the supernatant was collected by centrifugation. Then the purified desired protein—human RNA-binding protein 19 was obtained by a His.Bind Quick Cartridge (Novagen) affinity column with binding 6His-Tag. SDS-PAGE showed a single band at 19 kDa (FIG. 2). The band was transferred onto the PVDF membrane and the N terminal amino acid was sequenced by Edams Hydrolysis, which shows that the first 15 amino acids on N-terminus were identical to those in SEQ ID NO: 2.

Example 6 Preparation of Antibody Against Human RNA-Binding Protein 19

[0097] The following specific human RNA-binding protein 19 polypeptide was synthesized by a polypeptide synthesizer (PE-ABI): NH2-Met-Leu-Cys-His-LeuGln-Arg-Met-Val-Ser-Glu-Gln-Cys-His-Leu-COOH (SEQ ID NO:7). The polypeptide was conjugated with hemocyanin and bovine serum albumin (BSA) respectively to form two composites (See Avrameas et al., Immunochemistry,1969, 6:43). 4 mg of hemocyanin-polypeptide composite was used to immunize rabbit together with Freund's complete adjuvant. The rabbit was re-immunized with the hemocyanin-polypeptide composite and Freund's incomplete adjuvent 15 days later. The titer of antibody in the rabbit sera was determined with a titration plate coated with 15 μg/ml BSA-polypeptide composite by ELISA. The total IgG was isolated from the sera of an antibody positive rabbit with Protein A-Sepharose. The polypeptide was bound to Sepharose 4B column activated by cyanogen bromide. The antibodies against the polypeptide were isolated from the total IgG by affinity chromatography. The immunoprecipitation showed that the purified antibodies could specifically bind to human RNA-binding protein 19.

Example 7 Application of the Polynucleotide Fragments as Hybrid Probes

[0098] Oligonucleotides selected from the polynucleotide of the instant invention can be versatilly applied as hybrid probes. The probes could be used to determine the existence of polynucleotide of the invention or its homologous polynucleotide sequences by hybridization with genomic, or cDNA libraries from normal or clinical tissues of various origins. The probes could be further used to determine whether polynucleotide of the invention or its homologous polynucleotide sequences are abnormally expressed in cells from normal or clinical tissues.

[0099] The aim of the following example is to select suitable oligonucletide fragments from SEQ ID NO: 1 as hybird probes to apply in membrane hybridization to determine whether there is polynucleotide of said invention or its homologous polynucleotide sequences in examined tissues. Membrane hybridization methods include dot hybridization, Southern blot, Northern blot, and replica hybridization. All these methods follow nearly the same steps after the polynucleotide samples are immobilized on membranes. These same steps are: membranes with samples immobilized on are prehybridized in hybrid buffer not containing probes to block nonspecific binding sites of the samples on membranes. Then prehybridization buffer is replaced by hybridization buffer containing labeled probes and incubation continues at the appropriate temperature so probes hybridize with the target nucleotides. Free probes are washed off by a series of washing steps after the hybridization step. A high-stringency washing condition (relatively low salt concentration and high temperature) is applied to reduce the hybridization background but retain highly specific signal. Two types of probes are selected for the example: the first type is oligonucleotides identical or annealed to SEQ ID NO: 1 the second type is oligonucleotides partially identical or partially annealed to SEQ ID NO: 1. Dot blot method is applied in the said example for immobilization of the samples on membrane. The strongest specific signal is produced by hybridization between first type probes and samples after relatively stringent membrane washing steps.

[0100] Selection of Probes

[0101] The principles below should be followed and some things should be taken into consideration for selection of oligonucleotide fragments from SEQ ID NO: 1 as hybrid probes:

[0102] 1. The optimal length of probes should be between eighteen and fifty nucleotides.

[0103] 2. GC content should be between 30% and 70%, since nonspecific hybridization increases when GC content is more than 70%.

[0104] 3. There should be no complementary regions within the probes themselves.

[0105] 4. Probes satisfying the requirements above could be initially selected for further computer-aided sequence analysis, which includes homology comparison between the initial selected probes and its source sequence region (SEQ ID NO: 1), and other known genomic sequences and their complements. Generally, probes should not be used when they share fifteen identical continuous base pairs, or 85% homology with a non-target region.

[0106] 5. Whether said initial selected probes should be chosen for final application depends on further experimental confirmation.

[0107] The following two probes are selected and synthesized after the analysis above:

[0108] Probe one belongs to the first type probes, which is completely identical or annealed to the gene fragments of SEQ ID NO: 1(41 Nt);

[0109] 5′-TGGTGAAGCTGTTCATCGGAAACCTGCCCCGAGAGGCTACA-3″ (SEQ ID NO: 8)

[0110] Probe two belongs to the second type probes which is a replaced or mutant sequence of the gene fragments of SEQ ID NO: 1, or of its complementary fragments (41 Nt):

[0111] 5′-TGGTGAAGCTGTTCATCGGACACCTGCCCCGAGAGGCTACA-3′ (SEQ ID NO: 9)

[0112] Any other frequently used reagents unlisted but involved in the following concrete experimental steps and their preparation methods can be found in the reference: DNA PROBES G. H. Keller; M. M. Manak; Stockton Press, 1989 (USA) or a more commonly used molecular cloning experimental handbook (Molecular Cloning) (J. Sambrook et al. Acadimic press, 1998, 2^(nd) edition)

[0113] Sample Preparation:

[0114] 1) DNA Extraction from Fresh or Frozen Tissues

[0115] Steps: 1) move the fresh or newly thawed tissue (source tissue of the polyucleotide) onto a ice-incubated dish containing phosphate-buffered saline (PBS). Cut the tissue into small pieces with a scissor or an operating knife. Tissue should be kept moist through the operation. 2) mince the tissue by centrifugation at 2,000 g for 10 minutes. 3) resuspend the pellet (about 10 ml/g) with cold homogenating buffer (0.25 mol/l saccharose; 25 mmol/l Tris-HCl, pH 7.5; 25 m mol/L NaCl; 25 mmol/L MgCl₂) at 4° C., and homogenate tissue suspension at full speed with an electronic homogenizer until it's completely smashed. 5) centrifuge at 1,000 g for 10 minutes. 6) resuspend the cell pellet (1-5 ml per 0.1 g initial tissue sample), and centrifuge at 1,000 g for 10 minutes. 7) resuspend the pellet with lysis buffer (1-5 ml per 0.1 g initial tissue sample), and continue to the phenol extraction method.

[0116] 2) Phenol Extraction of DNA

[0117] Steps: 1) wash cells with 1-10 ml cold PBS buffer and centrifuge at 1000 g for 10 minutes. 2) resuspend the precipitated cells with at least 100 μl cold cell lysis buffer (1×10⁸ cells/ml). 3) add SDS to a final concentration of 1%. Addition of SDS into the cell precipitation before cell resuspension will cause the formation of large cell aggregates which are difficult to break and total yield will be reduced. This phenomenon is especially severe when extracting more than 10⁷ cells. 5) incubate at 50° C. for an hour or shake gently overnight at 37° C. 6) add an equal volume of phenol: chloroform: isoamyl alcohol (25:24:1) to the DNA solution to be purified in a microcentrifuge tube, and centrifuge for 10 minutes. If the two phases are not clearly separated, the solution should be recentrifuged. 7) remove the water phase to a new tube. 8) add an equal volume of chloroform: isoamyl alcohol (24:1) and centrifuge for 10 minutes. 9) remove the water phase containing DNA to a new tube and then purify DNA by ethanol precipitation.

[0118] 3) DNA Purification by Ethanol Precipitation

[0119] Steps: 1) add {fraction (1/10)} vol of 2 mol/L sodium acetate and 2 vol of cold 100% ethanol into the DNA solution, mix and place at −20° C. for an hour or overnight. 2) centrifuge for 10 minutes. 3) carefully spill the ethanol. 4) add 500 μl of cold 70% ethanol to wash the pellet and centrifuge for 5 minutes. 6) carefully remove the ethanol and invert the tube on bibulous paper to remove the remaining ethanol. Air dry for 10-15 minutes to evaporate ethanol on pellet surface. But notice not to dry the pellet completely since completely dry pellet is difficult to be dissolved again. 7) resuspend the DNA pellet with a small volume of TE or water. Spin at low speed or blow with a drip tube, and add TE gradually and mix until DNA is completely dissolved. Add about 1 μl TE for every 1-5×10⁶ cells.

[0120] The following 8-13 steps are applied only when contamination must be removed, otherwise go to step 14 directly. 8) add RNase A into DNA solution to a final concentration of 100 μg/ml and incubate at 37° C. for 30 minutes. 9) add SDS and protease K to the final concentration of 0.5% and 100 μg/ml respectively, and incubate at 37° C. for 30 minutes. 10) add an equal volume of phenol: chloroform: isoamyl alcohol (25:24:1), and centrifuge for 10 minutes. 11) carefully remove the water phase and extract it with an equal volume of chloroform: isoamyl alcohol (24:1) and centrifuge for 10 minutes. 12) carefully remove the water phase, and add {fraction (1/10)} vol of 2 mol/L sodium acetate and 2.5 vol of cold 100% ethanol, then mix and place at −20° C. for an hour. 13) wash the pellet with 70% ethanol and 100% ethanol, air dry and resuspend DNA as same as steps 3-6. 14) determine the purity and production of DNA by A₂₆₀ and A₂₈₀ assay. 15) separate DNA sample into several portions and store at −20° C.

[0121] Preparation of Sample Membrane:

[0122] 1) Take 4×2 pieces of nitrocellulose membrane (NC membrane) of desired size, and lightly mark out the sample dot sites and sample number with a pencil. Every probe needs two pieces of NC membrane, so then membranes could be washed under high stringency condition and stringency condition individually in the following experimental steps.

[0123] 2) Pipette 15 μl of samples and control individually, dot them on the membrane, and dry at room temperature.

[0124] 3) Place the membranes on filter paper soaked in 0.1 mol/l NaOH, 1.5 mol/L NaCl, leave for 5 minutes (twice), and allow to dry. Transfer the membranes on filter paper soaked in 0.5 mol/L Tris-HCl (pH7.0), 3 mol/L NaCl, leave for 5 minutes (twice), and allow to dry.

[0125] 4) Place the membranes between clean filter paper, packet with aluminum foil, and vacuum dry at 60-80° C. for 2 hours.

[0126] Labeling of Probes

[0127] 1) Add 3 μl probe (0.1 OD/10 μl), 2 μl kinase buffer, 8-10 μCi γ-³²P-dATP+2U Kinase, and add water to the final volume of 20 μl.

[0128] 2) Incubate at 37° C. for 2 hours.

[0129] 3) Add ⅕ vol bromophenol blue indicator (BPB).

[0130] 4) Load that sample on Sephadex G-50 column.

[0131] 5) Collect the first peak before the elution of ³²P-Probe (monitor the eluting process by Monitor).

[0132] 6) Five drops each tube and collect for 10-15 tubes.

[0133] 7) Measure the isotope amount with liquid scintillator

[0134] 8) Merged collection of the first peak is the prepared ³²P-Probe (the second peak is free γ-³²P-dATP)

[0135] Prehybridization

[0136] Place the sample membranes in a plastic bag, add 3-10 mg prehybrid buffer (10× Denhardt's; 6×SSC, 0.1 mg/ml CT DNA (calf thymus gland DNA)), seal the bag, and shake on a 68° C. water bath for two hours hybridization.

[0137] Hybridization

[0138] Cut off a corner of the plastic bag, add in prepared probes, seal the bag, and shake on a 42° C. water bath overnight.

[0139] Membrane washing under a high-stringency condition:

[0140] 1) Take out the hybridized sample membranes

[0141] 2) Wash the membranes with 2×SSC, 0.1% SDS at 40° C. for 15 minutes (twice).

[0142] 3) Wash the membranes with 0.1×SSC, 0.1% SDS at 40° C. for 15 minutes (twice).

[0143] 4) Wash the membranes with 0.1×SSC, 0.1% SDS at 55° C. for 30 minutes (twice), and dry at room temperature.

[0144] Membrane washing under a low-stringency condition:

[0145] 1) Take out the hybridized sample membranes.

[0146] 2) Wash the membranes with 2×SSC, 0.1% SDS at 37° C. for 15 minutes (twice).

[0147] 3) Wash the membranes with 0.1×SSC, 0.1% SDS at 37° C. for 15 minutes (twice).

[0148] 4) Wash the membranes with 0.1×SSC, 0.1% SDS at 40° C. for 15 minutes (twice), and dry at room temperature.

[0149] X Ray Autoradiography:

[0150] X ray autoradiograph at −70° C. (autoradiograph time varies according to radioactivity of the hybrid spots)

[0151] Experimental Results:

[0152] In hybridization experiments carried out under low-stringency membrane washing condition, the radioactivity of the above two probes hybridization spots show no obvious difference; while in hybridization experiments carried out under high-stringency membrane washing condition, radioactivity of the hybrid spot by probe one is obviously stronger than the other three's. So probe one could be applied in qualitative and quantitative analysis of the existence and differential expression of said invented polynucleotide in different tissues.

INDUSTRIAL APPLICABILITY

[0153] The polypeptide of the invention and antagonists, agonists and inhibitors thereof can be directly used for the treatment of diseases, e.g., various malignant tumors or cancers, dermatitis, inflammation, adrenoprival disease and HIV infection and immune system diseases.

[0154] In eukaryotes, the interaction between single stranded RNA and protein is extensively involved in cell physiological activities, such as RNA synthesis and processing, mRNA stabilization, protein synthesis, cell proliferation, maturation and apoptosis. Single stranded RNA binding proteins can be classified as heterogeneous nuclear ribonucleoproteins (hnRNP), and small nuclear ribonucleoproteins (snRNP), which are associated with mRNA precursor splicing, mRNA and precursor mRNA associated proteins, cell proliferation and maturation associated protein X16, proteins involved in apoptosis, TIA-1 and TIAR, etc. All the above proteins include characteristic conservative sequence: xxxxxxx######xxxxxxxxxxxxxxxxxxxxxxxxxxxxx########xxxxxxxxxxxxxxxxxxxxxxxxx        RNP-2                               RNP-1

[0155] Wherein, the sequence of RNP-1 is [RK]-G-EDRKHPCG-[AGSCI]-[FY]-[LIVA]-x-[FYLM]. This specific conservative sequence is necessary for the formation of the active motif. The abnormal expression of this characteristic sequence will lead to many disorders in cell physiological processes such as protein translation, cell proliferation and maturation, apoptosis, etc., and further result in correlated diseases. The polypeptide of the present invention has high homology and similarity with human RNA binding protein in structure and function. The amino acid sequence of this polypeptide contains the above conservative characteristic sequence. The interaction of the novel polypeptide of the invention and single stranded RNA in vivo is involved in extensive cell physiological processes such as RNA synthesis and processing, mRNA stabilization, protein translation, cell proliferation, maturation and apoptosis. The abnormal expression of the above specific conservative sequence will result in the abnormal function of the new polypeptide of the invention, and may further lead to protein metabolic disorders, embryo development malformation, various tumors and auto-immune diseases. These diseases include but not limit to:

[0156] I. Auto-Immune Diseases:

[0157] 1. Connective tissue disease, including rheumatoid arthritis, systemic lupus erythematosus, dermatomyositis, scleroderma etc;

[0158] 2. Neuromuscular disease, such as Multiple sclerosis, myasthenia gravis, demyelination disease etc;

[0159] 3. Endocrinopathy, such as primary adrenal atrophy, chronic thyroiditis, juvenile diabetes etc;

[0160] 4. Digestive system diseases: Chronical nonspecific ulcerative colitis, chronical active hepatitis, pernicious anemia, atrophic gastricism;

[0161] 5. Urinary system diseases: autoimmunity glomerulonephritis, lung-kidney Hemorrhagic syndrome etc;

[0162] 6. Hematologic diseases: autoimmunity hemolytic anemia, autoimmune thrombocytopenic purpura, idiopathic thrombocytopenia etc;

[0163] II. Common Deformity in Embryogenesis:

[0164] 1. The common deformity of face, neck and extremity:

[0165] (1) Cheiloschisis (most common, with alveolar process cleft and palatoschisis), palatoschisis, oblique facial cleft, cervical cyst, cervical fistula etc;

[0166] (2) The common deformity of extremity:

[0167] 1) Meromelia:

[0168] Horizontal deletion (congenital complete phocomelia): abrachia, aforearm, acheiria, adactylia, aleg, adactylia etc;

[0169] Perpendicular deletion: epipod radius/ulnar side deletion, lower limb tibia/sural side deletion, phocomelia etc;

[0170] 2) Extremity differentiation disorder: certain muscular muscle group deletion, joint hypoplasia, bone deformity, bone confluence, polydactyly, syndactylia, equinovarus etc;

[0171] 2. The common deformity of digestive system:

[0172] Thyroglossal cyst, blood digestion tube atresia or constriction, diverticulum of ileum, umbilical fistula, congenital umbilical hernia, congenital non-ganglionic giant colon, imperforate anus, stumbled bowel translocation abnormality, bile duct atresia, annular pancreas etc;

[0173] 3. Common deformity of respiratory system:

[0174] bronchia tracheal stenosis, tracheoesophageal fistula, hyaline membrane disease, unilateral pulmonary agenesis, ectopic lung lobe, congenital pulmonary cyst, atelectasis etc.;

[0175] 4. Common deformity of urinary system:

[0176] polycystic kidney, ectopic kidney, horse-shoe kidney, double ureter, urachal fistula, ectopia vesicae etc;

[0177] 5. Common deformity of genital system:

[0178] cryptorchidism, congenital inguinal hernia, gemini, atresia of vagina, hypospadia, true hermaphroditism/pseudohermaphroditism, testicular feminization syndrome etc;

[0179] 6. The common deformity of cardiovascular system:

[0180] atrial septal defect, ventricular septal defect, trunus arteriosus partition abnormality (displacement of aorta and pulmonary Artery, aorta and pulmonary stenosis), patent ductus arteriosus etc;

[0181] 7. The common deformity of nervous system:

[0182] neural tube defect (anencephaly, myeloschisis, meningomyelocele, meningohydroencephalocele), internal/external hydrocephalus etc;

[0183] III. Various Tissue Tumors:

[0184] 1. Epithelial tissue:

[0185] Papilloma, epidermoid carcinoma (skin, nasopharynx, larynx, neck of uterus), adenoma (adenocarcinoma) (mammary gland, thyroid), mucinous/serous cystadenoma (serous cystadenocarcinoma) (ovarium), basal cell carcinoma (head-face skin), (malignant) multi form adenoma, papilloma, transitional epithelium carcinoma (bladder, calyx) etc;

[0186] 2. Mesothelial tissue:

[0187] Inom (fibrosarcoma) (limbs), (malignant) fibrous histiocytoma (limbs), lipoma (liposarcoma) (hypodermis, lower limb, retroperitoneum), leiomyoma (leiomyosarcoma) (uterus, stomach and intestine), Rhabdomyoma(rhabdomyosarcoma) (head&neck, genitourinary tract, limbs), haemangioma (hemangiosarcoma), lymphangioma (lymphangiosarcoma) (skin, hypodermis, tongue, labia), osteoma (osteosarcoma) (cranium, long bone), (malignant) Giant Cell tumor (the upper part of femur/tibia/humerus), chondroma (chondrosarcoma) (extremity short bone, pelvic pone/costa/femur/humerus/scapul), synovioma (synovial sarcoma) (near knee joint/ankle joint/wrist joint/shoulder joint/elbow joint), (malignant) mesothelioma (pleura/peritoneum) etc;

[0188] 3. Lymph Hematopoiesis tissues:

[0189] Malignant lymphoma (neck, mediastinum, mesentery and retroperitoneal lymph node), various leucocythemia (lymph Hematopoiesis tissues), multiple myeloma (vertebra/sternum/costa/cranium and long bone) etc;

[0190] 4. Nerve tissues:

[0191] Fibroneuroma (neurofibrosarcoma) (total body cutaneous nerve/deep part nerve and splanchna), (malignant) neurilermmoma (nerves in the head, neck and limbs etc), (malignant) glioma (cerebrum), medulloblastoma (cerebellum), (malignant) meningioma (Meninges), knob neuroblastoma/neuroblastoma (retromediastinum and retroperitoneum/adrenal medulla) etc;

[0192] 5. Other tumors:

[0193] Melanotic nevus, malignant melanoma (skin, mucosa), (malignant) hydatidiform mole, chorionepithilioma (uterus), (malignant) supporting cell/interstitial cell tumor, (malignant) granulosa cell tumor (ovary, testes), seminoma (testes), dysgerminoma (ovary), embryonal carcinoma (testes, ovary), (malignant) teratoma (ovary, testes, mediastinum and sacrum) etc;

[0194] IV. Diseases Related to Protein Metabolism Disorder:

[0195] Disorders in protein metabolism will affect some major physiological functions and lead to diseases such as:

[0196] 1. Diseases related to energy supply, tissue growth, renewal, and repair: muscular atrophy, weak extremities, weight loss, and even “Dyscrasia” in some severe cases.

[0197] 2. Production of some physiologically active substances such as hormones, antibodies, amines etc:

[0198] (1) disorders of peptide hormone will lead to diseases such as:

[0199] 1) Diseases related to insulin and glucagon: diabetes, hypoglycemia etc;

[0200] 2) Hypothalamic hormone and hypophyseal hormones: gigantism, pygmyism, acromegaly, hypercortisolism (cushings syndrome), Primary aldosteronism, recurring chronic hypoadrenocorticism, hyperthyroidism, hypothyroidism (cretinism, Juvenile hypothyroidism, adulthood hypothyroidism), male/female Infertility, menstruation disturbance (functional Metrorrhagia, Menoschesis, polycystic ovary syndrome, premenstrual tension syndrome, climacteric syndrome), sexual development disorder, diabetes insipidus, improperly antidiuretic hormone excretion syndrome, lactation abnormity etc;

[0201] 3) Parathormone: parathormone hyperfunction syndrome, parathormone hypofunction syndrome etc;

[0202] 4) Gastrointestinal hormone: peptic ulcer, chronic indigestion, chronic gastritis etc;

[0203] (2) The metabolic disorder of amines will lead to diseases such as:

[0204] Cardiac arrhythmia, shock, mental confusion, epilepsia, chorea, hepatic encephalopathy (noradrenalin, γ-amino butyric acid, 5-serotonin, glutamine), motion sickness, 1-allergic disease (hives, hay fever, allergic rhinitis, skin allergy), peptic ulcer (ergamine), Hypercholesterolemia (taurine), tumor (polyamine) etc;

[0205] (3) Defect of antibody will lead to various infections such as:

[0206] Hematosepsis, purulent meningitis, pneumonia, tracheitis, tympanitis, pyoderma etc;

[0207] 3. Specific physiology of some proteins:

[0208] Various hemoglobinopathy (anaemia, icterus, tissue anoxia caused organic acidemia), various deficiency of coagulation factors syndrome (bleeding), muscular spasm, myotonus, myoparalysis (actin) etc.

[0209] From the above it is clear that the polypeptide of the invention and its antagonist, agonist and inhibitor can be directly used to treat many diseases, such as protein metabolic disorder diseases, developmental malformation of embryo, various tumors and auto-immune diseases etc. In addition, as apoptosis is a part of human cell cycle, which is related to human aging, this protein can be applied to human anti-aging research.

[0210] The invention also provides methods for screening compounds so as to identify an agent which enhances human RNA binding protein 19 activity (agonists) or decrease human RNA binding protein 19 activity (antagonists). The agonists enhance the biological functions of human RNA binding protein 19 such as inactivation of cell proliferation, while the antagonists prevent and cure the disorders associated with the excess cell proliferation, such as various cancers. For example, in the presence of an agent, the mammal cells or the membrane preparation expressing human RNA binding protein 19 can be incubated with the labeled human RNA binding protein 19 to determine the ability of the agent to enhance or repress the interaction.

[0211] Antagonists of human RNA binding protein 19 include antibodies, compounds, receptor deletants and analogues. The antagonists of human RNA binding protein 19 can bind to human RNA binding protein 19 and eliminate or reduce its function, or inhibit the production of human RNA binding protein 19, or bind to the active site of said polypeptide so that the polypeptide can not function biologically.

[0212] When screening for compounds as an antagonist, human RNA binding protein 19 may be added into a biological assay. It can be determined whether the compound is an antagonist or not by determining its effect on the interaction between human RNA binding protein 19 and its receptor. Using the same method as that for screening compounds, receptor deletants and analogues acting as antagonists can be selected. Polypeptide molecules capable of binding to human RNA binding protein 19 can be obtained by screening a polypeptide library comprising various combinations of amino acids bound onto a solid matrix. Usually, human RNA binding protein 19 is labeled in the screening.

[0213] The invention further provides a method for producing antibodies using the polypeptide, and its fragment, derivative, analogue or cells as an antigen. These antibodies may be polyclonal or monoclonal antibodies. The invention also provides antibodies against epitopes of human RNA binding protein 19. These antibodies include, but are not limited to, polyclonal antibody, monoclonal antibody, chimeric antibody, single-chain antibody, Fab fragment and the fragments produced by a Fab expression library.

[0214] Polyclonal antibodies can be prepared by immunizing animals, such as rabbit, mouse, and rat, with human RNA binding protein 19. Various adjuvants, including but are not limited to Freund's adjuvant, can be used to enhance the immunization. The techniques for producing human RNA binding protein 19 monoclonal antibodies include, but are not limited to, the hybridoma technique (Kohler and Milstein. Nature,1975, 256:495-497), the trioma technique, the human B-cell hybridoma technique, the EBV-hybridoma technique and so on. A chimeric antibody comprising a constant region of human origin and a variable region of non-human origin can be produced using methods well-known in the art (Morrison et al, PNAS,1985, 81:6851). Furthermore, techniques for producing a single-chain antibody (U.S. Pat. No. 4,946,778) are also useful for preparing single-chain antibodies against human RNA binding protein 19.

[0215] The antibody against human RNA binding protein 19 can be used in immuno histochemical method to detect the presence of human RNA binding protein 19 in a biopsy specimen.

[0216] The monoclonal antibody specific to human RNA binding protein 19 can be labeled by radioactive isotopes, and injected into human body to trace the location and distribution of human RNA binding protein 19. This radioactively labeled antibody can be used in the non-wounding diagnostic method for the determination of tumor location and metastasis.

[0217] Antibodies can also be designed as an immunotoxin targeting a particular site in the body. For example, a monoclonal antibody having high affinity to human RNA binding protein 19 can be covalently bound to bacterial or plant toxins, such as diphtheria toxin, ricin, ormosine. One common method is to challenge the amino group on the antibody with sulfydryl cross-linking agents, such as SPDP, and bind the toxin onto the antibody by interchanging the disulfide bonds. This hybrid antibody can be used to kill human RNA binding protein 19-positive cells.

[0218] The antibody of the invention is useful for the therapy or the prophylaxis of disorders related to the human RNA binding protein 19. The appropriate amount of antibody can be administrated to stimulate or block the production or activity of human RNA binding protein 19.

[0219] The invention further provides diagnostic assays for quantitative and in situ measurement of human RNA binding protein 19 level. These assays are well known in the art and include FISH assay and radioimmunoassay. The level of human RNA binding protein 19 detected in the assay can be used to illustrate the importance of human RNA binding protein 19 in diseases and to determine the diseases associated with human RNA binding protein 19.

[0220] The polypeptide of the invention is useful in the analysis of polypeptide profile. For example, the polypeptide can be specifically digested by physical, chemical, or enzymatic means, and then analyzed by one, two or three dimensional gel electrophoresis, preferably by spectrometry.

[0221] New human RNA binding protein 19 polynucleotides also have many therapeutic applications. Gene therapy technology can be used in the therapy of abnormal cell proliferation, development or metabolism, which are caused by the loss of human RNA binding protein 19 expression or the abnormal or non-active expression of human RNA binding protein 19. Recombinant gene therapy vectors, such as virus vectors, can be designed to express mutated human RNA binding protein 19 so as to inhibit the activity of endogenous human RNA binding protein 19. For example, one form of mutated human RNA binding protein 19 is a truncated human RNA binding protein 19 whose signal transduction domain is deleted. Therefore, this mutated human RNA binding protein 19 can bind the downstream substrate without the activity of signal transduction. Thus, the recombinant gene therapy vectors can be used to cure diseases caused by abnormal expression or activity of human RNA binding protein 19. The expression vectors derived from a virus, such as retrovirus, adenovirus, adeno-associated virus, herpes simplex virus, parvovirus, and so on, can be used to introduce the human RNA binding protein 19 gene into the cells. The methods for constructing a recombinant virus vector harboring human RNA binding protein 19 gene are described in the literature (Sambrook, et al. supra). In addition, the recombinant human RNA binding protein 19 gene can be packed into liposome and then transferred into the cells.

[0222] The methods for introducing the polynucleotides into tissues or cells include directly injecting the polynucleotides into tissue in the body; or introducing the polynucleotides into cells in vitro with vectors, such as virus, phage, or plasmid, etc, and then transplanting the cells into the body.

[0223] Also included in the invention are ribozyme and the oligonucleotides, including antisense RNA and DNA, which inhibit the translation of the human RNA binding protein 19 mRNA. Ribozyme is an enzyme-like RNA molecule capable of specifically cutting certain RNA. The mechanism is nucleic acid endo-cleavage following specific hybridization of ribozyme molecule and the complementary target RNA. Antisense RNA and DNA as well as ribozyme can be prepared by using any conventional techniques for RNA and DNA synthesis, e.g., the widely used solid phase phosphite chemical method for oligonucleotide synthesis. Antisense RNA molecule can be obtained by the in vivo or in vitro transcription of the DNA sequence encoding said RNA, wherein said DNA sequence is integrated into the vector and downstream of the RNA polymerase promoter. In order to increase its stability, a nucleic acid molecule can be modified in many manners, e.g., increasing the length of two the flanking sequences, replacing the phosphodiester bond with the phosphothioester bond in the oligonucleotide.

[0224] The polynucleotide encoding human RNA binding protein 19 can be used in the diagnosis of human RNA binding protein 19 related diseases. The polynucleotide encoding human RNA binding protein 19 can be used to detect whether human RNA binding protein 19 is expressed or not, and whether the expression of human RNA binding protein 19 is normal or abnormal in the case of diseases. For example, human RNA binding protein 19 DNA sequences can be used in the hybridization with biopsy samples to determine the expression of human RNA binding protein 19. The hybridization methods include Southern blotting, Northern blotting and in situ blotting, etc., which are well-known and established techniques. The corresponding kits are commercially available. A part of or all of the polynucleotides of the invention can be used as probe and fixed on a microarray or DNA chip for analysis of differential expression of genes in tissues and for the diagnosis of genes. The human RNA binding protein 19 specific primers can be used in RNA-polymerase chain reaction and in vitro amplification to detect transcripts of human RNA binding protein 19.

[0225] Further, detection of mutations in human RNA binding protein 19 gene is useful for the diagnosis of human RNA binding protein 19-related diseases. Mutations of human RNA binding protein 19 include site mutation, translocation, deletion, rearrangement and any other mutations compared with the wild-type human RNA binding protein 19 DNA sequence. The conventional methods, such as Southern blotting, DNA sequencing, PCR and in situ blotting, can be used to detect a mutation. Moreover, mutations sometimes affects the expression of protein. Therefore, Northern blotting and Western blotting can be used to indirectly determine whether the gene is mutated or not.

[0226] Sequences of the present invention are also valuable for chromosome identification. The sequence is specifically targeted to and can hybridize with a particular location on an individual human chromosome. There is a current need for identifying particular sites of gene on the chromosome. Few chromosome marking reagents based on actual sequence data (repeat polymorphism) are presently available for marking chromosomal location. The mapping of DNA to chromosomes according to the present invention is an important first step in correlating those sequences with genes associated with disease.

[0227] Briefly, sequences can be mapped to chromosomes by preparing PCR primers (preferably 15-35 bp) from the cDNA. These primers are then used for PCR screening of somatic cell hybrids containing individual human chromosomes. Only those hybrids containing the human gene corresponding to the primer will yield an amplified fragment.

[0228] PCR mapping of somatic cell hybrids is a rapid procedure for assigning a particular DNA to a particular chromosome. Using the oligonucleotide primers of the invention, sublocalization can be achieved with panels of fragments from specific chromosomes or pools of large genomic clones in an analogous manner. Other mapping strategies that can similarly be used to map to its chromosome include in situ hybridization, prescreening with labeled flow-sorted chromosomes and preselection by hybridization to construct chromosome specific-cDNA libraries.

[0229] Fluorescence in situ hybridization (FISH) of a cDNA clones to a metaphase chromosomal spread can be used to provide a precise chromosomal location in one step. For a review of this technique, see Verma et al., Human Chromosomes: a Manual of Basic Techniques, Pergamon Press, New York (1988).

[0230] Once a sequence has been mapped to a precise chromosomal location, the physical position of the sequence on the chromosome can be correlated with genetic map data. Such data are found, for example, in V. McKusick, Mendelian Inheritance in Man (available on line through Johns Hopkins University Welch Medical Library). The relationship between genes and diseases that have been mapped to the same chromosomal region are then identified through linkage analysis.

[0231] Next, it is necessary to determine the differences in the cDNA or genomic sequence between affected and unaffected individuals. If a mutation is observed in some or all of the affected individuals but not in any normal individuals, then the mutation is likely to be the cause of the disease. Comparison of affected and unaffected individuals generally involves first looking for structural alterations in the chromosomes, such as deletions or translocations, that are visible from chromosome level, or detectable using PCR based on that DNA sequence. With current resolution of physical mapping and genetic mapping techniques, a cDNA precisely localized to a chromosomal region associated with the disease could be one of 50 to 500 potential causative genes. (This assumes 1 megabase mapping resolution and one gene per 20 kb).

[0232] According to the invention, the polypeptides, polynucleotides and its mimetics, agonists, antagonists and inhibitors may be employed in combination with a suitable pharmaceutical carrier. Such a carrier includes but is not limited to water, glucose, ethanol, salt, buffer, glycerol, and combinations thereof. Such compositions comprise a safe and effective amount of the polypeptide or antagonist, as well as a pharmaceutically acceptable carrier or excipient with no influence on the effect of the drug. These compositions can be used as drugs in disease treatment.

[0233] The invention also provides a pharmaceutical pack or kit comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. With such container(s) there may be a notice from a governmental agency, that regulates the manufacture, use or sale of pharmaceuticals or biological products, the notice reflects government's approval for the manufacture, use or sale for human administration. In addition, the polypeptides of the invention may be employed in conjunction with other therapeutic compounds.

[0234] The pharmaceutical compositions may be administered in a convenient manner, such as through topical, intravenous, intraperitoneal, intramuscular, subcutaneous, intranasal or intradermal routes. human RNA binding protein 19 is administered in an amount, which is effective for treating and/or prophylaxis of the specific indication. The amount of human RNA binding protein 19 administrated on patient will depend upon various factors, such as delivery methods, the subject health, the judgment of the skilled clinician.

1 9 1 1712 DNA Homo sapiens CDS (201)..(734) 1 agaagcgtcc gcgccgcgag gaggaggccc tgctggtttc tgtgcgggtg agactccgag 60 cctttccact gcctttcttg tactgtgtta aatcttctct cactcccttg ggcttcgggg 120 gtgtcctggt aggtccgcag tctccacacc cgtcactgag agccgacctc ggtcctcggc 180 attgcgcggc tcttgtcagg atg gtg aag ctg ttc atc gga aac ctg ccc cga 233 Met Val Lys Leu Phe Ile Gly Asn Leu Pro Arg 1 5 10 gag gct aca gag cag gag att cgc tca ctc ttc gag cag tat ggg aag 281 Glu Ala Thr Glu Gln Glu Ile Arg Ser Leu Phe Glu Gln Tyr Gly Lys 15 20 25 gtg ctg gaa tgt gac atc att aag aat tac ggc ttt gtg cac ata gaa 329 Val Leu Glu Cys Asp Ile Ile Lys Asn Tyr Gly Phe Val His Ile Glu 30 35 40 gac aag acg gca gct gag gat gcc ata cgc aac ctg cac cat tac aag 377 Asp Lys Thr Ala Ala Glu Asp Ala Ile Arg Asn Leu His His Tyr Lys 45 50 55 ctt cat ggg gtg aac atc aac gtg gaa gcc agc aag aat aag agc aaa 425 Leu His Gly Val Asn Ile Asn Val Glu Ala Ser Lys Asn Lys Ser Lys 60 65 70 75 acc tca aca aag ttg cat gtg ggc aac atc agt ccc acc tgc acc aat 473 Thr Ser Thr Lys Leu His Val Gly Asn Ile Ser Pro Thr Cys Thr Asn 80 85 90 aag gag ctt cga gcc aag ttt gag gag tat ggt ccg gtc atc gaa tgt 521 Lys Glu Leu Arg Ala Lys Phe Glu Glu Tyr Gly Pro Val Ile Glu Cys 95 100 105 gac atc gtg aaa gat tat gcc ttc gta cac atg gag cgg gca gag gat 569 Asp Ile Val Lys Asp Tyr Ala Phe Val His Met Glu Arg Ala Glu Asp 110 115 120 gca gtg gag gcc atc agg ggc ctt gat aac aca gag ttt caa ggt gaa 617 Ala Val Glu Ala Ile Arg Gly Leu Asp Asn Thr Glu Phe Gln Gly Glu 125 130 135 cca ccc tct ttg ggt aga ggg ctg aac aca agg ctg tgt gca gaa aat 665 Pro Pro Ser Leu Gly Arg Gly Leu Asn Thr Arg Leu Cys Ala Glu Asn 140 145 150 155 ggt tgg ata agt aaa agg aga ggt ttg gta aag ata aca gct gtt ggc 713 Gly Trp Ile Ser Lys Arg Arg Gly Leu Val Lys Ile Thr Ala Val Gly 160 165 170 tgg ctg gtg atg aag aaa taa gtgtgggtga tggacttctt atgatgtaga 764 Trp Leu Val Met Lys Lys 175 atgcatggga cttaggggct ttaccttagg caaatgtctc ctggagaaaa gccactcacc 824 ttttatttgg agcccctacg gcttttgtgc ttatcagtgc agaaaccctt ttctttgaag 884 gctttctgag ttactgggcc ttttttattt tttatttttt tgtagtagag cacagttcag 944 agttcctcac tctgaattta ttgccctcag cacaggatca gaattctgca ttttacgtga 1004 agaacctctc aaaaacatgt caagcgacac ttataggacc agaatccttg ttaagctgtc 1064 ctaccttaca caaactcttt aaagggttac agctcttgtt gcttttatat tatacctgta 1124 ccaagggatt gtattttgag tttaaggcca ctctagaatt acaaggctga ttttaggact 1184 tcctggggag gaggcactgg ggttttaggg gcggtaatga ctgtcttttc attggtttgg 1244 ggggctggac tttataagat tttggtgaat agagcactta gatttgtgtt atcttggagt 1304 cttaaccaaa tgaatctttt gtgcctggag ggcagcatgg gtgatatgtg gattgtcact 1364 tcatttggaa gcatctcaaa tccccagcat tttgaatgcc tacatgttgc tcaaaggaaa 1424 tgcttgttag agcattttgg attttgaatt ttcagatttg ggatgctaaa atggtacgta 1484 gaacgcaaat attccaaaat ctgaggtctg aagcaacagt ggcagttcag gggtggtgat 1544 catggtgagt tgctatctga actcttcttt cacctccttt gggttcccag tgtcaaaaag 1604 agtggtgtcc ttttttagct taattaagca ggactgaaca aaaataataa aaaataaaaa 1664 aagccttatt caaaaaaaaa aaaaacatgt cggccgcctc ggcctatg 1712 2 177 PRT Homo sapiens 2 Met Val Lys Leu Phe Ile Gly Asn Leu Pro Arg Glu Ala Thr Glu Gln 1 5 10 15 Glu Ile Arg Ser Leu Phe Glu Gln Tyr Gly Lys Val Leu Glu Cys Asp 20 25 30 Ile Ile Lys Asn Tyr Gly Phe Val His Ile Glu Asp Lys Thr Ala Ala 35 40 45 Glu Asp Ala Ile Arg Asn Leu His His Tyr Lys Leu His Gly Val Asn 50 55 60 Ile Asn Val Glu Ala Ser Lys Asn Lys Ser Lys Thr Ser Thr Lys Leu 65 70 75 80 His Val Gly Asn Ile Ser Pro Thr Cys Thr Asn Lys Glu Leu Arg Ala 85 90 95 Lys Phe Glu Glu Tyr Gly Pro Val Ile Glu Cys Asp Ile Val Lys Asp 100 105 110 Tyr Ala Phe Val His Met Glu Arg Ala Glu Asp Ala Val Glu Ala Ile 115 120 125 Arg Gly Leu Asp Asn Thr Glu Phe Gln Gly Glu Pro Pro Ser Leu Gly 130 135 140 Arg Gly Leu Asn Thr Arg Leu Cys Ala Glu Asn Gly Trp Ile Ser Lys 145 150 155 160 Arg Arg Gly Leu Val Lys Ile Thr Ala Val Gly Trp Leu Val Met Lys 165 170 175 Lys 3 24 DNA Artificial oligonucleotide primer 3 agaagcgtcc gcgccgcgag gagg 24 4 24 DNA Artificial oligonucleotide primer 4 cataggccga ggcggccgac atgt 24 5 33 DNA Artificial oligonucleotide primer 5 ccccatatga tggtgaagct gttcatcgga aac 33 6 33 DNA Artificial oligonucleotide primer 6 catggatcct tatttcttca tcaccagcca gcc 33 7 15 PRT Artificial portion of SEQ ID NO 2 7 Met Val Lys Leu Phe Ile Gly Asn Leu Pro Arg Glu Ala Thr Glu 1 5 10 15 8 41 DNA Artificial oligonucleotide primer 8 tggtgaagct gttcatcgga aacctgcccc gagaggctac a 41 9 41 DNA Artificial oligonucleotide primer 9 tggtgaagct gttcatcgga cacctgcccc gagaggctac a 41 

We claim:
 1. An isolated polypeptide-human RNA binding protein 19 comprising a polypeptide having the amino acid sequence of SEQ ID NO: 2, its active fragments, analogues and derivatives.
 2. The polypeptide of claim 1 wherein amino acid sequences of said polypeptide, its analogues or derivatives have at least 95% identity with the amino acid sequence of SEQ ID NO:
 2. 3. The polypeptide of claim 2 wherein said polypeptide is a polypeptide comprising the amino acid sequence of SEQ ID NO:
 2. 4. An isolated polynucleotide selected from the group consisting of: (a) the polynucleotide encoding a polypeptide having an amino acid sequence of SEQ ID NO: 2 or its fragment, analogue, derivative; (b) the polynucleotide complementary to polynucleotide (a); and (c) the polynucleotide sharing at least 70% identity to polynucleotide (a) or (b).
 5. The polynucleotide of claim 4 comprising a polynucleotide encoding an amino acid sequence of SEQ ID NO:2.
 6. The polynucleotide of claim 4 wherein the sequence of said polynucleotide comprises position 201-734 of SEQ ID NO:1 or position 1-1712 of SEQ ID NO:1.
 7. A recombinant vector containing an exogenous polynucleotide which is constructed with the polynucleotide of any of claims 4-6 and plasmid, virus, or expression vector.
 8. A genetically engineered host cell containing an exogenous polynucleotide which is selected form the group consisting of: (a) the host cell transformed or transfected by the recombinant vector of claim 7; and (b) the host cell transformed or transfected by the polynucleotide of any of claims 4-6.
 9. A method for producing a polypeptide having the activity of human RNA binding protein 19, which comprises the steps of: (a) culturing the engineered host cell of claim 8 under the conditions suitable for expression of human RNA binding protein 19; (b) isolating the polypeptides having the activity of human RNA binding protein 19 protein from the culture.
 10. An antibody specifically which binds bound specifically with human RNA binding protein
 19. 11. A compound simulating or regulating the activity or expression of the polypeptide which is the compound simulating, improving, antagonizing, or inhibiting the activity of human RNA binding protein
 19. 12. The compound of claim 11 which is an antisense sequence of the polynucleotide sequence of SEQ ID NO: 1 or its fragment.
 13. The use of the compound of claim 11 for regulating the activity of human RNA binding protein 19 in vivo or in vitro.
 14. A method for detecting a disease related to the polypeptide of any of claims 1-3 or susceptibility thereof which comprises detecting the amount of expression of said polypeptide, or detecting the activity of said polypeptide, or detecting the nucleotide variant of the polynucleotide causing said abnormal expression or activity.
 15. The use of the polypeptide of any of claims 1-3 for screening the mimetics, agonists, antagonists or inhibitors of human RNA binding protein 19; or for the identification of peptide spectrum.
 16. The use of the nucleic acid molecule of any of claims 4-6 wherein it is used as primer in the nucleic acid amplification, or as probe in the hybridization reaction, or is used for manufacture of gene chip or microarray.
 17. The use of the polypeptide, polynucleotide or compound of any of claims 1-6 and 11 wherein a safe and effective amount of said polypeptide, polynucleotide or its mimetics, agonists, antagonists or inhibitors are mixed with the pharmaceutically acceptable carrier to form the pharmaceutical composition for the diagnosis or treatment of diseases associated with the abnormality of human RNA binding protein
 19. 18. The use of the polypeptide, polynucleotide or compound of any of claims 1-6 and 11 wherein said polypeptide, polynucleotide or compound are used for the manufacture of medicine for the treatment of developmental disorders, diseases caused by abnormal metabolism of immune system, and cancers. 